Predictive factors for survival in stage IIIA N2 NSCLC patients treated with neoadjuvant CCRT followed by surgery.

PURPOSE: To assess the impact of imaging, surgical, histopathologic and patient-related factors on the risks of recurrence and overall survival (OS) in stage IIIA-N2 non-small cell lung cancer (NSCLC) patients undergoing definitive resection after neoadjuvant concurrent chemoradiotherapy (CCRT).

METHODS: We retrospectively examined 104 consecutive patients with stage IIIA-N2 NSCLC who received neoadjuvant CCRT followed by surgery between 2008 and 2011. While reviewing the clinical and surgical data, we also assessed histopathologic and imaging (CT and PET/CT) factors. Disease-free survival (DFS) and OS were estimated with predictors for recurrence and survival.

RESULTS: The 3-year OS for patients with and without recurrence was 37.1 and 63.3 %, respectively (p < 0.001). Size decrease of target lesion(s) ≥36 % on post-neoadjuvant CCRT CT (p = 0.048) and viable tumor size on surgical specimen <9.4 mm (p = 0.035) were related to longer OS. Regarding shorter DFS, tumor size on post-neoadjuvant CCRT CT (p = 0.046), SUV(max) of the primary tumor (p = 0.011), male gender (p = 0.023), total tumor size on surgical specimen (p = 0.041) and viable tumor size on surgical specimen (p = 0.043) were the significant predictors.

CONCLUSIONS: OS is prolonged with greater extent of size decrease of target lesion(s) on post-neoadjuvant CCRT CT and smaller viable tumor size on surgical specimen. Larger tumor size on post-neoadjuvant CCRT CT, higher SUV(max), male gender, larger total tumor size and larger viable tumor size on surgical specimen may herald the higher probability of recurrence and the necessity of more attention.